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Re: Insert using a subselect?

From: Jason Tan <jason(at)rebel(dot)rebel(dot)net(dot)au>
To: Francisco Reyes <lists(at)natserv(dot)com>
Cc: Pgsql Novice <pgsql-novice(at)postgresql(dot)org>
Subject: Re: Insert using a subselect?
Date: 2001-09-11 05:22:52
Message-ID: Pine.LNX.3.95.1010911145227.27217H-100000@rebel.rebel.net.au (view raw or flat)
Thread:
Lists: pgsql-novice

You need to make it return just one row.
It doenst knwo which value to use in the insert.

Jason

On Tue, 11 Sep 2001, Francisco Reyes wrote:

> On Tue, 11 Sep 2001, Jason Tan wrote:
> 
> >
> > On Mon, 10 Sep 2001, Francisco Reyes wrote:
> >
> > > Does PostgreSQL supports doing an insert with a subselect as it's value?
> > > Something like:
> > > insert into hearn_dates (date)
> > > values ((select distinct merge_date from hearn));
> > > The error I am getting is:
> > > ERROR:  More than one tuple returned by a subselect used as an expression.
> >
> > Presumably you slect distinct is returing more than one value/tuple.
> >
> > Run it by hand and see what it returns.
> 
> drf=# select distinct merge_date from hearn;
>  merge_date
> ------------
>  2000-11-17
>  2001-07-10
>  2001-09-07
> (3 rows)
> 
> 3 rows on 1 column.
> 
> 
> 
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--
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Jason Tan                                                jason(at)rebel(dot)net(dot)au
     "Democracy is two wolves and a lamb voting on what to have for lunch. 
                 Liberty is a well-armed lamb contesting the vote."
                               ~Benjamin Franklin, 1759
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